Skatecycle , Rock Skate board,Skate cycle , Wheel board 1)Aluminum body 2) ... exert to gain and maintain momentum on flat ground. Skatecycle , Rock Skate board,Skate cycle , Wheel board,two wheel cycle Measures ... different size crossbars?Currently there is only one size. Skatecycle , Rock Skate board,Skate cycle , Wheel board,two wheel cycle